CN203890290U - Coke oven equipment - Google Patents
Coke oven equipment Download PDFInfo
- Publication number
- CN203890290U CN203890290U CN201420305217.9U CN201420305217U CN203890290U CN 203890290 U CN203890290 U CN 203890290U CN 201420305217 U CN201420305217 U CN 201420305217U CN 203890290 U CN203890290 U CN 203890290U
- Authority
- CN
- China
- Prior art keywords
- coke oven
- flue
- oven
- smoke pipe
- loop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000000571 coke Substances 0.000 title claims abstract description 52
- 239000003546 flue gas Substances 0.000 claims abstract description 59
- 239000000779 smoke Substances 0.000 claims abstract description 47
- 238000006243 chemical reaction Methods 0.000 claims abstract description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 48
- 229910052742 iron Inorganic materials 0.000 claims description 24
- 239000003638 chemical reducing agent Substances 0.000 claims description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical class [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 8
- 239000002918 waste heat Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model provides coke oven equipment comprising a coke oven, a main flue, a chimney and a loop smoke tube, wherein the coke oven, the main flue, the loop smoke tube and the chimney are communicated with one another in sequence; coke oven flue gas generated by the coke oven is discharged into the atmosphere by virtue of the main flue, the loop smoke tube and the chimney in sequence; a heat exchange device and an induced draft fan are connected in series to the loop smoke tube along the flow direction of the coke oven flue gas in sequence; a denitration reaction device is also connected in series to the loop smoke tube and is used for performing denitration on the coke oven flue gas. The coke oven equipment provided by the utility model can the purpose achieve that the content of nitrogen oxygen compounds in the coke oven flue gas is reduced so as to ensure that the coke oven flue gas discharged by the chimney meets the national emission standards; meanwhile, the corrosion to the heat exchange device and the induced draft fan caused by the coke oven flue gas can be reduced, thus the maintenance of the heat exchange device and the induced draft fan can be reduced, the operation efficiency can be further improved, and the maintenance cost and the operation cost of the equipment also can be reduced.
Description
Technical field
The utility model belongs to coking technology field, is specifically related to a kind of coke oven for iron.
Background technology
Coke oven for iron is for making coal carbonization to produce the equipment of coke, belonging to the main Thermal Equipment of coking.In actual applications, the coke-oven gas of coke oven for iron and air produce flue gases of cock oven at the flue base burning of coke oven, and flue gases of cock oven can enter in atmosphere via flue, regenerator, bottom flue, exchange shutter, minute flue, main flue and chimney successively.
The temperature range of the flue gases of cock oven of discharging due to main flue is generally at 240～320 ℃, and exhaust gas volumn is very large, therefore, has larger waste heat recovery to be worth.For this reason, application number is to disclose a kind of smoke waste heat recycling device for coke oven in 201120483940.2 patent, as shown in Figure 1, it comprises that the flue collector 1 of coke oven flue gas is arranged on chimney 11 flue collectors of flue collector end UNICOM's loop smoke pipe 6 side by side, on loop smoke pipe 6, be disposed with heat-exchanger rig 8 and induced draft fan 10, and be provided with the first trip valve 2 and the second trip valve 3 at inlet end and the exit end of loop smoke pipe, and, on loop smoke pipe 6, be communicated with side by side bypass flue 5, the two ends of bypass flue 5 are communicated with respectively the exit end at the inlet end of the first trip valve 2 and the second trip valve 3, on bypass flue 5, be provided with the 3rd trip valve 4.
At present, reclaim the waste heat of flue gases of cock oven through above-mentioned smoke waste heat recycling device for coke oven after, directly via chimney, drain into atmosphere.Yet, owing to containing a large amount of oxynitrides (NO in flue gases of cock oven
x), be generally 800～1200mg/m
3this flue gases of cock oven is directly disposed in atmosphere, can pollute atmospheric environment, and national regulation was from 1 day January in 2015, existing coal chemical enterprise is carried out GB16171-2012 emission standard, that is, existing enterprise's execution Air Pollutant Emission concentration limit is in coke oven smoke stack emission flue gas, to contain oxynitrides lower than 150～500mg/m
3, therefore, flue gases of cock oven needs to carry out denitrogenation (that is, denitration) processing before being disposed to atmosphere.For this reason, need badly now and a kind ofly can realize the coke oven for iron that flue gases of cock oven is carried out to denitration.
Utility model content
The utility model is intended at least solve one of technical problem existing in prior art, has proposed a kind of coke oven for iron, and it can realize the content that greatly reduces oxynitrides in flue gases of cock oven, makes the flue gases of cock oven of smoke stack emission meet discharging standards; And, can reduce the corrosion of flue gases of cock oven heat exchanging device and induced draft fan, thereby can reduce the maintenance of heat exchanging device and induced draft fan, and then not only can improve operational efficiency, can also reduce equipment maintenance cost and running cost.
The problem existing for solving the utility model, the utility model provides a kind of coke oven for iron, it comprises coke oven, flue collector, chimney and loop smoke pipe, described coke oven, described flue collector, described loop smoke pipe and described chimney are connected successively, the flue gases of cock oven that described coke oven produces enters atmosphere via described flue collector, described loop smoke pipe and described chimney successively, the flow direction along flue gases of cock oven on the smoke pipe of described loop is serially connected with denitration reaction device, heat-exchanger rig and induced draft fan successively, for described flue gases of cock oven is carried out to denitration, heat exchange, dispatch.
Wherein, on the smoke pipe of described loop, and be also serially connected with the first trip valve between the output terminal of described flue collector and the inlet end of described denitration reaction device.
Wherein, on the smoke pipe of described loop, and be also serially connected with the second trip valve between the input terminus of described chimney and the output terminal of described induced draft fan.
Wherein, described denitration reaction device comprises Benitration reactor and denitrification reducing agent input tube, is provided with the catalyzer as denitration reaction in described Benitration reactor; Described denitrification reducing agent input tube is connected with described loop smoke pipe, and between described Benitration reactor and the exhaust side of described flue collector, in order to carry denitrification reducing agent in described flue gases of cock oven.
Wherein, described denitrification reducing agent comprises ammoniacal liquor or ammonia.
Wherein, also comprise bypass flue, described bypass flue and described loop smoke pipe are arranged in parallel, and the inlet end of described bypass flue is connected with the exhaust side of described flue collector, and the exhaust side of described bypass flue is connected with the inlet end of described chimney.
Wherein, on described bypass flue, be serially connected with the 3rd trip valve.
Wherein, described denitration reaction device comprises Benitration reactor and denitrification reducing agent input tube, is provided with the catalyzer as denitration reaction in described Benitration reactor; Described denitrification reducing agent input tube is connected with described loop smoke pipe, and between described Benitration reactor and described the first trip valve, in order to carry denitrification reducing agent in described flue gases of cock oven.
Wherein, in described Benitration reactor, described catalyzer is provided with multilayer along the flow direction of described flue gases of cock oven.
The utlity model has following beneficial effect:
The coke oven for iron that the utility model provides, it is serially connected with denitration reaction device on the smoke pipe of loop, this compared with prior art, by denitration reaction device, can realize flue gases of cock oven is carried out to denitration processing, can realize the content that reduces oxynitrides in flue gases of cock oven, make the flue gases of cock oven of smoke stack emission meet discharging standards; And, due to before denitration reaction device is arranged on heat-exchanger rig and induced draft fan, this can realize flue gases of cock oven and carry out after denitration, enter again heat-exchanger rig and induced draft fan, thereby can reduce the corrosion of flue gases of cock oven heat exchanging device and induced draft fan, thereby can reduce the maintenance of heat exchanging device and induced draft fan, and then not only can improve operational efficiency, can also reduce equipment maintenance cost and running cost.
Accompanying drawing explanation
Fig. 1 is the sectional view of smoke waste heat recycling device for coke oven; And
The structural representation of the coke oven for iron that Fig. 2 provides for the utility model.
Embodiment
For making those skilled in the art understand better the technical solution of the utility model, coke oven for iron the utility model being provided below in conjunction with accompanying drawing is described in detail.
The structural representation of the coke oven for iron that Fig. 2 provides for the utility model.Refer to Fig. 2, the coke oven for iron that the present embodiment provides, it comprises coke oven 20, flue collector 21, chimney 22 and loop smoke pipe 23, coke oven 20, flue collector 21, loop smoke pipe 23 and chimney 22 are connected successively, the flue gases of cock oven that coke oven 20 produces is successively via flue collector 21, loop smoke pipe 23 and chimney 22 enter atmosphere, the flow direction along flue gases of cock oven on loop smoke pipe 23 is serially connected with denitration reaction device 233 successively, heat-exchanger rig 231 and induced draft fan 232, , this compared with prior art, by denitration reaction device 233, can realize flue gases of cock oven is carried out to denitration processing, can realize and reduce oxynitrides (NO in flue gases of cock oven
x) content, make the flue gases of cock oven of smoke stack emission meet discharging standards.
In the present embodiment, preferably, denitration reaction device 233 is arranged between heat-exchanger rig 231 and the exhaust side of flue collector 21.Due to before denitration reaction device 233 is arranged on heat-exchanger rig 231 and induced draft fan 232, this can realize flue gases of cock oven and carry out after denitration, enter again heat-exchanger rig 231 and induced draft fan 232, thereby can reduce the corrosion of flue gases of cock oven heat exchanging device 231 and induced draft fan 232, thereby can reduce the maintenance of heat exchanging device and induced draft fan, and then not only can improve operational efficiency, can also reduce equipment maintenance cost and running cost.
Preferably, in the present embodiment, on loop smoke pipe 23, and be also serially connected with the first trip valve 234 between the output terminal of flue collector 21 and the inlet end of denitration reaction device 233, when keeping in repair in order to the heat-exchanger rig 231 on loop smoke pipe 23, induced draft fan 232, denitration reaction device 233, this first trip valve 234 closes, and open in carrying out technological process time, that is to say, the first trip valve 234 is as maintenance control valves, thereby can improve security and the controllability of the coke oven for iron that the present embodiment provides.
Further preferably, on loop smoke pipe 23, and be also serially connected with the second trip valve 235 between the input terminus of chimney 22 and the output terminal of induced draft fan 232, the second trip valve 235 and the first trip valve 234 are similar, all as maintenance control valve, and the second trip valve 235 is in order to cut out after the first trip valve 234 cuts out, and opened before the first trip valve 234 is opened, thereby can further improve security and the controllability of equipment.
In addition preferably, in the present embodiment, coker also comprises bypass flue 24, bypass flue 24 is arranged in parallel with loop smoke pipe 23, the inlet end of bypass flue 24 is connected with the exhaust side of flue collector 21, and the exhaust side of bypass flue 24 is connected with the inlet end of chimney 22, can be so that emergent switching by bypass flue 24, and do not hinder the operation of whole system, thereby can improve the security of the present embodiment.
Further preferably, on bypass flue 24, be serially connected with the 3rd trip valve 241, by controlling the opening and closing of the 3rd trip valve 241, control connection or the disconnection of bypass flue 24, particularly, can when process stabilizing, control the 3rd trip valve 241 closes, so that bypass flue 24 disconnections, thereby make flue gases of cock oven self-loop smoke pipe 23 drain into chimney 22; When emergency situation appears in technique, controlling the 3rd trip valve 241 opens, the first trip valve 234 and the second trip valve 235 are closed so that bypass flue 24 is communicated with, thereby make flue gases of cock oven drain into chimney 22 from bypass flue 24, therefore, by the 3rd trip valve 241, can improve handiness and the controllability of the coke oven for iron of the present embodiment raising.
In the present embodiment, denitration reaction device 233 comprises Benitration reactor 2331 and denitrification reducing agent input tube 2332, is provided with the catalyzer as denitration reaction in Benitration reactor 2331, and this catalyzer is nickeliferous catalyzer; Denitrification reducing agent input tube 2332 is connected with loop smoke pipe 23, and between Benitration reactor 2331 and the first trip valve 234, in order to carry denitrification reducing agent in flue gases of cock oven, wherein, denitrification reducing agent comprises ammoniacal liquor or ammonia, under the effect of catalyzer, there is following reaction in flue gases of cock oven and denitrification reducing agent:
4NO+4NH
3+O
2＝4N
2+6H
2O，6NO
2+8NH
3＝7N
2+12H
2O；
The reactant N generating
2and H
2o does not have much impacts to atmosphere, thereby realize, flue gases of cock oven is completed to denitration; And, because the temperature range of the flue gases of cock oven of discharging from flue collector 21 is at 240～320 ℃, and the optimum temperature range of denitration reaction is at 300～400 ℃, therefore, directly flue collector 21 and denitration reaction device 233 are connected, between the two, do not need to arrange heat-exchanger rig, thereby not only can be so that denitration effect is good, thereby can greatly reduce the content of oxynitrides in the flue gases of cock oven after denitration, make the flue gases of cock oven of chimney 22 discharges reach discharging standards; But also can be so that the coke oven for iron that this enforcement provides rational in infrastructure, compact and reduced place area occupied and space; And, can be energy-efficient, make heat-exchanger rig 231 produce saturation steam, energy-saving effect is remarkable.
Particularly, in Benitration reactor 2331, catalyzer is provided with multilayer along the flow direction of flue gases of cock oven,, along multi-layer catalyst layer is set from right to left in Fig. 2 in Benitration reactor 2331, flue gases of cock oven is reduced to below discharging standards the content of oxynitrides through after last one deck catalyst layer in mobile process.
In the present embodiment, heat-exchanger rig 231 comprises inlet channel 2311 and gas exhaust duct 2312, and inlet channel 2311 is to heat-exchanger rig 231 input water, and water is at the steam of the heat formation of the interior absorption flue gases of cock oven of heat-exchanger rig 231, in order to realize waste heat recovery.
It should be noted that, in actual applications, denitrification reducing agent input tube is connected with loop smoke pipe, and optional position that can be between Benitration reactor and the exhaust side of flue collector, in order to carry denitrification reducing agent in flue gases of cock oven, for example, denitrification reducing agent input tube can also be between the first trip valve 234 and the exhaust side of flue collector 21.
Also it should be noted that, in the present embodiment, denitration reaction device 233, by the Benitration reactor 2331 and the denitrification reducing agent input tube 2332 that are provided with catalyzer, is realized and is adopted the mode of catalytic reduction to carry out denitration.But the present invention is not limited thereto, in actual applications, denitration reaction device 233 can adopt other structures to realize denitration.For example, denitration reaction device 233 comprises heating unit and the Benitration reactor being connected in series successively along the flow direction of flue gases of cock oven, in Benitration reactor, be provided with flue gases of cock oven in the reactant of oxynitrides generation denitration reaction, heating unit is heated to the required temperature of technique by the flue gases of cock oven of discharging from flue collector 21, in this case, denitration reaction device is realized and is adopted the mode of non-catalytic reduction to carry out denitration; For another example, denitration reaction device 233 also can adopt the mode of charcoal absorption to carry out denitration, and in this case, denitration reaction device can specifically arrange corresponding device according to the processing condition of charcoal absorption denitration, for example, and heating unit or refrigerating unit etc.; Certainly, in actual applications, denitration reaction device 233 can also adopt other modes to carry out denitration, at this, does not enumerate.
Further it should be noted that, in the present embodiment, denitration reaction device 233 is arranged between heat-exchanger rig 231 and the exhaust side of flue collector 21.But, the present invention is not limited thereto, in actual applications, denitration reaction device 233 can be arranged on the optional position of loop smoke pipe 23, for example, denitration reaction device 233 is arranged between heat-exchanger rig 231 and induced draft fan 232, because heat-exchanger rig 231 can make the temperature reduction from the flue gases of cock oven of main air blower output, therefore, denitration reaction device 233 should also comprise and is arranged on the inlet end of Benitration reactor 2331 and the well heater between heat exchanger 231, and be arranged on the exhaust side of Benitration reactor 2331 and the water cooler between induced draft fan 232.
It should be noted that in addition, in the present embodiment, by bypass flue 24, so that emergent switching, still, the present invention is not limited thereto, in actual applications, also can save bypass flue 24.
Be understandable that, above embodiment is only used to principle of the present utility model is described and the illustrative embodiments that adopts, yet the utility model is not limited to this.For those skilled in the art, in the situation that not departing from spirit of the present utility model and essence, can make various modification and improvement, these modification and improvement are also considered as protection domain of the present utility model.
Claims (9)
1. a coke oven for iron, it comprises coke oven, flue collector, chimney and loop smoke pipe, described coke oven, described flue collector, described loop smoke pipe and described chimney are connected successively, the flue gases of cock oven that described coke oven produces enters atmosphere via described flue collector, described loop smoke pipe and described chimney successively, it is characterized in that, the flow direction along flue gases of cock oven on the smoke pipe of described loop is serially connected with denitration reaction device, heat-exchanger rig and induced draft fan successively, for described flue gases of cock oven is carried out to denitration, heat exchange, dispatch.
2. coke oven for iron according to claim 1, is characterized in that, on the smoke pipe of described loop, and is also serially connected with the first trip valve between the output terminal of described flue collector and the inlet end of described denitration reaction device.
3. coke oven for iron according to claim 1, is characterized in that, on the smoke pipe of described loop, and is also serially connected with the second trip valve between the input terminus of described chimney and the output terminal of described induced draft fan.
4. coke oven for iron according to claim 1, is characterized in that, described denitration reaction device comprises Benitration reactor and denitrification reducing agent input tube, is provided with the catalyzer as denitration reaction in described Benitration reactor; Described denitrification reducing agent input tube is connected with described loop smoke pipe, and between described Benitration reactor and the exhaust side of described flue collector, in order to carry denitrification reducing agent in described flue gases of cock oven.
5. coke oven for iron according to claim 4, is characterized in that, described denitrification reducing agent comprises ammoniacal liquor or ammonia.
6. according to the coke oven for iron described in claim 1-5 any one, it is characterized in that, also comprise bypass flue, described bypass flue and described loop smoke pipe are arranged in parallel, the inlet end of described bypass flue is connected with the exhaust side of described flue collector, and the exhaust side of described bypass flue is connected with the inlet end of described chimney.
7. coke oven for iron according to claim 6, is characterized in that, is serially connected with the 3rd trip valve on described bypass flue.
8. coke oven for iron according to claim 2, is characterized in that, described denitration reaction device comprises Benitration reactor and denitrification reducing agent input tube, is provided with the catalyzer as denitration reaction in described Benitration reactor; Described denitrification reducing agent input tube is connected with described loop smoke pipe, and between described Benitration reactor and described the first trip valve, in order to carry denitrification reducing agent in described flue gases of cock oven.
9. according to the coke oven for iron described in claim 4 or 8, it is characterized in that, in described Benitration reactor, described catalyzer is provided with multilayer along the flow direction of described flue gases of cock oven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420305217.9U CN203890290U (en) | 2014-06-09 | 2014-06-09 | Coke oven equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420305217.9U CN203890290U (en) | 2014-06-09 | 2014-06-09 | Coke oven equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203890290U true CN203890290U (en) | 2014-10-22 |
Family
ID=51716718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420305217.9U Expired - Lifetime CN203890290U (en) | 2014-06-09 | 2014-06-09 | Coke oven equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203890290U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104774625A (en) * | 2015-03-19 | 2015-07-15 | 山东钢铁股份有限公司 | Coke oven gas emergent cutting device |
| CN105457486A (en) * | 2015-11-24 | 2016-04-06 | 西安航天源动力工程有限公司 | Coke oven flue gas integrated treatment method |
-
2014
- 2014-06-09 CN CN201420305217.9U patent/CN203890290U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104774625A (en) * | 2015-03-19 | 2015-07-15 | 山东钢铁股份有限公司 | Coke oven gas emergent cutting device |
| CN105457486A (en) * | 2015-11-24 | 2016-04-06 | 西安航天源动力工程有限公司 | Coke oven flue gas integrated treatment method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: ANSHAN HUATAI COKING & REFRACTORY ENGINEERING TECHNOLOGY Co.,Ltd. Assignor: BEIJING HUATAI COKING ENGINEERING CONSULTING Corp. Contract record no.: 2015990000143 Denomination of utility model: Coke oven equipment Granted publication date: 20141022 License type: Exclusive License Record date: 20150330 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Section thirteen economic and Technological Development Zone of Beijing City 31 street 100176 No. two School District No. 15 Building 5 layer 501 Patentee after: HUATAI YONGCHUANG (BEIJING) TECHNOLOGY Co.,Ltd. Address before: 101318, building 14, Rong Hui Garden, B District, Shunyi District Airport Industrial Park, Beijing Patentee before: BEIJING HUATAI COKING ENGINEERING CONSULTING Corp. |
|
| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: ANSHAN HUATAI COKING & REFRACTORY ENGINEERING TECHNOLOGY Co.,Ltd. Assignor: BEIJING HUATAI COKING ENGINEERING CONSULTING Corp. Contract record no.: 2015990000143 Date of cancellation: 20201124 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20141022 |